ward assembly election; local council election
Refers specifically to elections for the legislative body of a special ward (区) in Tokyo, or similar administrative wards in other cities. The term is formal and used in political and administrative contexts.
The ward assembly election is scheduled to be held next month.
Voter turnout in ward assembly elections has been declining year by year.
Refers to city council elections, whereas 区議会議員選挙 is for ward assemblies, typically in Tokyo's special wards or designated cities.
Refers to Tokyo Metropolitan Assembly elections, a higher-level body compared to ward assemblies.
Compound of 区議会 (ward assembly) + 議員 (member) + 選挙 (election). The term is transparently derived from its components.